Check valve damper for brooder stoves



Feb. '16, 1932. R. o. #ENCE 1,845,337

CHECK VALVE DAMPER FOR BROODER STOVES Filed Feb. 8, 195o' Patented Feb.` 16, 1932 UNIrfEDISTArEs Bosco o. rENcn, or s'rEnLNG, KANSAS f J CHECK vVALVE rientrare ronrnoonnn .srovns Applicationy filed February 8.199,0,A seriai No. *42eme This invention relates to brooderlstovesl and particularly to `a thermostaticallyop'erated check valve therefor. TheY general object of the invention is to provide anfirn-V proved check valve damper which is so 'c0,n' structed and mounted that `fthe damper kswings inward in order to open the check 1 draft and when itis swung inward, it extends inwa'rd and downward so'as to cause-the air enteringthe check draft opening to beV directed downward directly against the heated air .escaping from the stove causing a turning back ofthe heated air.

A' further vobject is lto so1con'struct 'the damper that as it is swunginward, itreduces the effective areaoftheue opening, thus giving added checking eifectg, this damper,z f however,` when it is swung toits inoperative position formingnc'obstruction tov the p pas-y sage ofthe products of combustion ythrough y the flue.

A further object is to so .form a damper v*"th'at it will swing by gravity toits closedfpostatic means.

f azine 11, and a flue 12 which extends up sition, but when the damper isl swungto an open position-it is balanced, thus making the y damper very readily operable`r by a thermo.-

Other objects will appear inthe coursejof the following description. y

My invent-ion is illustrated in fthe'accomt panying drawings, wherein Figure 1 is a fragmentar draft damper open. In the drawings i much of the broeder stove as is necessary to illustrate my invention. In thedrawings,10'v

designates the body of the broeder' stove which isconstructed'in general accordance' with my application. Serial No..l26,975, filed on the 8th]` day* of February, 1930,y VThe brooder stove is formed to'provide themagthe magazine from the lire pot. A

.This flue is formed to providea check draft opening 13 formed with a` seatl at the lower Y verticalv section of a broeder Astvovershowing a check draft damper constructed in yaccordance with 'my we invention and the operating means therefor; VFigure 2 is a fragmentary sectiony onlthe same plane as Figure 1', but showing the check have illustrated only kso y kstat expands under'the action of heat, the lef' along g end andatthe sides of the opening and a seat v .16l at the top of the opening, theseat 16 facing outward7 while the seat 14 faces inward.

VVPivoted in any, suitable manner as upon ears proJecting fromA the bodyof the` stove is the@ f check draft damper '17. ',.Thisis formed to provide a -flatplate-like portion 18 and an angular portion 19 at lthe upperfend of the Vplate-lilieportionwhich angular portion is lthickened as it extends awayffromthe plane of the plate 18. and has aiflat facewhich engages4 avainst theL seat lf. Thedamper is pivoted 7by'a pivot pinr'or equivalent element 2(`) whichv` extends'through, the damper 'at the Junction ofthe portion 19 with the plate-likey portvn@ 181 The 'Plate-like POrtQ'n 18" at its upperjend.,adjacentthe .pivot is formed lwith the Aoutwardly projectingY ear Q 2li to which' a -rod 2.2"0p'eratively connected to any1 suitable thermostatically operated member is hinged.

1 have 'unarmed the rod 22ers being @afi-,- nected to a lever 24, this leverin turn lbeing .connected to a 'rod25 which passes down ,throughV a direct draft damper'26, the rod ycarrying a nut 27.` The lever24 is :provided at its linner end with an leye engaging theV frods 22 and 25 andat its outerend,this lever is upwardly bent and fulcrumed upon a support 2K8.,V 'Thermostatic bulbs 29 engage the `lever sothat when the bulbs expand, the inner end of the `lever will be'forced downward, kclosing the draft damper 26 and openingfthe check draft damper 17 and when they contract, the reverseaction takesplace.

With-this construction, when the thermo-- checkdraft damper vinward and upward to i' the/position shown in Figure 2@ If the damper is moved beyond this position, air willV enter above the balancing weight719 lwhich forms part of the damper proper and also below the vweight and this air is directed is, as shown, made thicker and heavier to-l ward the inner end of this Vportion away from the pivot of the damper. kWeight added at this point tends to press the lower part of the damper firmly against the opening and at the same time acts as a balance. This is necessary because the weight of the draw bar, draw wire and of the thermostat, if the latter rests on the draw bar will act to draw downward on the arm which extends downward from the damper. Under these circumstances with the damper nearly vertical, that is, in closed position, it is necessary to use a counter-weight in such a position as toovercome the weight of the parts mentioned above and to urge the lower end of the damper to a closed position. The counter-weight. portion 19 in my construction is ust suiicilently heavy so that .it will securely close'the-damper *and .not heavy enough to make any unnecessary weight to lift. With the lower end of the 'damper hanging nearly vertical, the

damper. wouldcaiise scarcely any pull what-V ever on the draw wire until the damper had been lifted ten or twelve degrees from lthe closed positon. At this point. the damper is exerting its greatest force on the pull wire 22, but this time the counter-.weightis shifted rearward and will have travelled sufficiently far outward as to practically counterbal- 40 1- of the damper. Thus at the time the damper is-in a horizontal position, it is so balanced ance the downward pressure at the other end that Vthe movement 4of the thermostat will readily controlthe damper. If the damper were shifted very much beyond the horizontal, the counter-weightwould overbalance the damper and hold. it in an open position, but

the extended arm is attached to the damper and furthermore the damper is never raised Y to greater than a horizontal position. IVhile the counter-weight tends to counterbalance the leverage of the damper as it is shifted v into a horizontal position, the damperis yet at all times urged'by its weight to a closed Y position. Y

With this'construction, the air entering the n check draft openingwhen the damper is lift ed is directed downward toward the lower end of thedamper and discharged directly against the heated air escaping from the damper must be actuated by a thermostatic element and thus must be delicately poised.

Furthermore, means must be used for checking the fire which acts quickly in order to prevent too great a heat from being genera-ted which would injure the chicks and my damper is particularly designed to secure this'eiect. A l

While I do not wish to limit myself to this, I Lpreferably place a false wall 37 in the `damperchambermspaced from the wall 11 thereof as the heat, were suoli a false wall not used,-would have a tendency to ignite the coal within the magazine and also some heat lwould'be lost that would radiate from wall 11. Thus` preferably I use a double wall l formed of the walls 37and l1 with an air space between. I do not wish to be limited either to the use of the damperv chamber as beingv formed integral with the body of the stove 10, as this damper chamber might be an independent unit. Y I claim i- 1. Ina brooder stove having a damper opening, a check draftdamper mounted in said opening'` comprising Aa relatively flat body portion and an inwardly extending angular portion at the upper endr'of thedalnper, 4 the damper being pivotedfor swinging movement at the junction yof these two portions,

the margins of the opening being formed to Y provide an inwardly facing seat for the lower margin vof the damper, and an outwardly facing seat for the upper-margin `of the Y damper, and means to swing the damper inward and upward to open the checkA draft.

y 2. In a broeder stove having a check draftk opening, a check draft damper disposed in said opening-consisting of a relatively flat portiony having an angularly'related portion Yat its upper end, the angularly related por- ,Y weight, the damper being pivotally mounted upon the wall of the opening on an axis apv VVproximately coincident with the junction this is made impossible by the angle at which" between the two portions of the damper, the wall of the opening being formed to provide an inwardly facingseat for the lower por tion of the damper below the pivot thereof and an outwardly facing seat for the angular end portion of the damper, and means for operating the damper.

3. In a broeder stove having a check draft 1 opening, a check draft damper disposed in said opening consistingiof a relatively flat l portion vhaving an angularly related portion at its upper end,-the angularly related'portion Vextending inward and upward and increasing in thickness toward its inner end whereby it may act as a counterbalancing weight, the damper being pivotally mounted upon the wall of the opening on an axis approximately coincident with the junction between the two portions of the damper, the wall of the opening being formed to provide an inwardly facing seat for the lower por tion of the damper below the pivot thereof and an outwardly facing seat for the angu-7 lar end portion of the damper and means for operating the damper including an ear projecting outward from the damper just below the pivot thereof and an operating rod operatively engaged with said ear.

4f. ln a broeder stove having a smoke Hue and a check draft opening disposed within the ue at the base thereof, a damper pivoted adjacent its upper end in said opening so that the lower end of the damper will swing inward and upward across a substantial area of the lower portion of the flue. i

5. n a brooder stove having a check draft opening and having a line above the checkdraft opening, a damper pivoted adjacent its upper end in said opening, the greatest portion of the weight ofthe damper being inward of its pivotal point whereby the damper will close by gravity, said damper when raised, swinging inward and upward and across a substantial portion of the opening of the flue.

6. A broeder stove having a check draft opening and having a flue, a damper pivoted `adjacent its upper end'in said opening,'the

damper having an angularly extending portion forming an acute anglewith the body of the damper, and normally bearing against the upper wallV of the Hue opening, the body ofthe damper and said extension thus acting tourge the damperto a closed position, said extension when the damper is raised a predetermined distance from itspseat 1noving out of contact with theupper wall of the damper opening to thereby permit. the inlet f of air both above and below the body of the damper, said extension acting as a counterbalance to the additional leverage exerted by the damper as it moves toward a horizontal position.

In testimony whereof I hereunto aiiiX my signature.

BOSCO O. FENCE. 

